Speaker base



FIG. 1 is a perspective view of a speaker base showing our new design;

FIG. 2 is a front view thereof;

FIG. 3 is a back view thereof;

FIG. 4 is a right view thereof;

FIG. 5 is top plan view thereof; and,

FIG. 6 is a bottom plan view thereof.

Those portions of the figures that are presented in broken lines merely illustrate the environment of the design and are not part of the claimed design. 

CLAIM The ornamental design for a speaker base, as shown and described. 